Functions intro

functions.js

// Performs an action, but caluculates/returns no value
// console.log(returnNothing());
var returnNothing = function() {
 console.log("I don't return anything");
};
// returnNothing();

// Does a task and returns the result of that task
var result = addStuff();

function addStuff() {
  var sum = 2+2;
  return sum;
  console.log("sum?", sum);
}
// console.log("result", result);

// Does a task with data we provide to it via the arguments
function add (one,two) {
  return one + two;
}
// var result = add("hello", " brave new", " world");
// console.log("Add with args", result );
function subtract (one, two) {
  return one - two;
}
// functions can take other functions as an argument. Whaaaat?
function performAction (numberOne, numberTwo, action) {
  var meDone = action(numberOne, numberTwo);
  return meDone;
}
var addResult = performAction(1, 2, add);
var subtractResult = performAction(1, 2, subtract);

console.log("addResult", addResult);
console.log("subtractResult", subtractResult);